So I did my second AG batch today and everything seemed to be going very well. I actually got about 80% BH efficiency, hit my preboil volume, and started brewing. It was all good until I got to rack to the fermentor. I had an absolutely inordinate amount of trub and ended up having to siphon through a lot of it just to get about 4 gallons of wort instead of the 5.25 I had tried to shoot for. And the fermentor looks like it is full of diluted oatmeal... Very thick and gritty looking.

I had to drop my friend off back at his house while I waited for the wort to chill and by the time I got back it was at 62 deg F. Dunno if that was related to why I had so much trub.

PS - Will I be fine to just let what I siphoned into the fermentor settle and maybe do a secondary in about a week or two to clear it out?

It'll compact over time after fermentation finishes knocking stuff around. You might end up losing half a gallon or so to trub. Lately I've been trying to limit the amount going to the carboy because it takes up space beer could be in. Last beer I neglected to and lost a little more than 1 gallon to trub and hop sludge from dry hopping.